if youre working with a booted,operational phone,you can flsh the file in the following manner:
-open a cmd window
-change to adb/fastboot directory
cd c:\foldername
(
cd c:\mini-adb if youve used any of my guides
)
-place the zip file you want to flash into adb/fastboot directory
-enable usb debug,disable fastboot,plug in phone
-check for connectivity
adb devices (should return serial number)
-boot to fastboot
adb reboot bootloader
-check for connectivity again
fastboot devices
-flash the file
fastboot erase cache
fastboto oem rebootRUU (will put you in ruu mode,black screen silver htc letters)
fastboot flash zip zipfilename.zip (will send and flash the file. dont interupt it while the cmd window shows its writinging,and the green status bar is moving on the phone screen)
*sometimes a file will fail with a pre-update error. this is normal,just enter again:
fastboot flash zip zipfilename.zip
and this time it will finish
-when you get "finished" and "OK"
fastboot reboot-bootloader (takes you back to fastboot)
-reboot back to the OS
fastbooot reboot
you can use this if you dont have an operational phone as well. you just need to manually put the phone in fastboot(select from hboot menu) then skip the "adb" commands and start with
fastboot devices